Single Spot Present After Tank Transfer Method

[Itchy Trigger]

I've just completed tank transfer method on an asfur angelfish. Tank transfer is part of my QT process for all new fish. This angel came in looking good, but developed a few spots of crypto a few days later while in my 15g QT, so I began the tank transfer procedure. I use two 5g tanks for tank transfer. After the TT was completed, I moved him back to his 15g (which had been sterilized too), and notice that he has one single spot on one of his pectoral fins. It looks like it COULD be crypto, but it doesn't seem like it SHOULD be, seeing as how the fish went through 5 transfers. Tanks were sterilized in between and everything was done correctly. I don't want to subject the fish to the TT process again if I don't have to, but I'm guessing that's the only way to be sure he's clean. Or is there some other way to tell for certain what this spot is?

[snorvich]

I am betting on lymphocystis. If the spot persists longer than 8 days it is lympho.

[Itchy Trigger]

Thanks, Steve. Hopefully that is what it is. I'll keep an eye on it.

[ThRoewer]

There are parasites that may encyst on fish like for example digenean trematodes which may look like Cryptocaryon nodules.

These are actually very common , diverse and have very interesting lifecycles. Here some articles I found:
Effect of the digenean parasites of fish on the fauna of Mediterranean lagoons. (http://www.ncbi.nlm.nih.gov/pubmed/18410068)
Ecology and diversity of digenean trematodes of reef and inshore fishes of Queensland (http://www.ncbi.nlm.nih.gov/pubmed/7982747)
Digenean trematodes of fish in the waters off Gökçeada, the Aegean Sea, Turkey (http://www.blackmeditjournal.org/pdf/283-298%20Vol19No3Akmirza.pdf)
Checklist of digenean trematodes reported from Indian marine fishes (http://www.ncbi.nlm.nih.gov/pubmed/21390585)

[Itchy Trigger]

There are parasites that may encyst on fish like for example digenean trematodes which may look like Cryptocaryon nodules.

These are actually very common , diverse and have very interesting lifecycles. Here some articles I found:
Effect of the digenean parasites of fish on the fauna of Mediterranean lagoons. (http://www.ncbi.nlm.nih.gov/pubmed/18410068)
Ecology and diversity of digenean trematodes of reef and inshore fishes of Queensland (http://www.ncbi.nlm.nih.gov/pubmed/7982747)
Digenean trematodes of fish in the waters off Gökçeada, the Aegean Sea, Turkey (http://www.blackmeditjournal.org/pdf/283-298%20Vol19No3Akmirza.pdf)
Checklist of digenean trematodes reported from Indian marine fishes (http://www.ncbi.nlm.nih.gov/pubmed/21390585)

Interesting stuff. So it seems these guys would need several different types of hosts present in order to complete their life cycle, and without those other hosts, they don't pose much of a threat. So unless I plan to introduce a duck and a mollusk to the QT, I should be ok... :wildone: